38 Site planningthan is normal for speech. An occasionally elevated error rate doesnot indicate a problem with your SIP DECT system. However, if youconsistently see a high error rate, then there is a problem with thedeployment of your SIP DECT system.Determine cell boundariesA specific RSSI value on the handset defines the cell boundary range.Links can be made outside the cell boundary but the audio quality of thelink is poor. The link drops if the handset and the basestation are too farapart.ATTENTIONDAPs must be able to receive synchronization signals from at least one otherDAP. This means the DAP must receive a signal strength of -80 dBm or betterfrom at least one other DAP.As shown in Figure 10 "Cell boundary terminology" (page 38), the cellboundary is the furthest point from the cell center where a clear radiosignal can be heard.The range from the cell center to the cell boundary, or the distance to apotential cell center from a critical point, is determined by using the cellboundary value and the deployment tool.Figure 10Cell boundary terminologyNortel Communication Server 1000SIP DECT FundamentalsNN43120-123 01.076 January 2009Copyright © 2008-2009 Nortel Networks.
